The Smith & Wesson Response Carbine is a semi-automatic blowback carbine chambered in 9mm Luger with a 16.5-inch barrel. At 6.2 lbs with a 23+1 capacity and a black finish, it is configured for range and home defense use in a familiar pistol-caliber package. 
 

Key Specifications 

• Manufacturer: Smith & Wesson 
• Model: Response Carbine 
• Caliber: 9MM Luger (9x19 Para) 
• Action Type: Semi-Automatic Blowback 
• Barrel Length: 16.5 inches 
• Capacity: 23 rounds (plus one in the chamber) 
• Weight: 6.2 lbs 
• Sights: Optic Ready with no front or rear sights included 
• Optic Mount: Compatible with 1913 Picatinny rail systems 
• Muzzle Type: Threaded with a standard 1/2"-28 thread pitch 
• Finish Color: Black 
   

Detailed Features 

The blowback action cycles the 9mm reliably and keeps the mechanism simple. The optic-ready top rail uses the 1913 Picatinny standard, so most red dots and LVPO scopes mount without adapters. The adjustable stock changes the length of pull to fit different shooter builds and clothing layers. The polymer grip accepts four interchangeable palmswell adapters for a customized fit. The 1/2"-28 threaded muzzle takes standard 9mm suppressors and muzzle devices. The 23+1 capacity is higher than most handguns in the same caliber, which is one of the practical advantages of the carbine format.

The Smith & Wesson 9mm Response Carbine draws positive reviews from shooters who use it at the range and for home defense, with a few practical considerations noted.

Accuracy comes up most often as a positive, with owners reporting consistent groups at range distances. The semi-auto action is described as easy to operate and well-suited to shooters across experience levels. The ergonomics get good marks, and the adjustable stock adds flexibility. Using 9mm is specifically called out as a positive by users who want lower recoil and more affordable ammunition than rifle calibers.

Weight is a recurring criticism -- at 6.2 lbs some owners find it heavier than expected for a pistol-caliber carbine. Magazine compatibility questions come up from users who already own 9mm handguns and want to share magazines. Price is seen as reasonable by most, though a few point to competing options at lower cost. Customization options via the Picatinny rail are viewed positively, though some owners would like more aftermarket part options overall.